From: Lee Gibson leegib@gmail.com

stable inclusion from stable-v4.19.314 commit 115103f6e3f1c26c473766c16439c7c8b235529a category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9R4BX CVE: CVE-2021-47347

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=l...

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[ Upstream commit d10a87a3535cce2b890897914f5d0d83df669c63 ]

Function wl1251_cmd_scan calls memcpy without checking the length. Harden by checking the length is within the maximum allowed size.

Signed-off-by: Lee Gibson leegib@gmail.com Signed-off-by: Kalle Valo kvalo@codeaurora.org Link: https://lore.kernel.org/r/20210428115508.25624-1-leegib@gmail.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Xia Fukun xiafukun@huawei.com --- drivers/net/wireless/ti/wl1251/cmd.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/ti/wl1251/cmd.c b/drivers/net/wireless/ti/wl1251/cmd.c index 9547aea01b0f..ea0215246c5c 100644 --- a/drivers/net/wireless/ti/wl1251/cmd.c +++ b/drivers/net/wireless/ti/wl1251/cmd.c @@ -466,9 +466,12 @@ int wl1251_cmd_scan(struct wl1251 *wl, u8 *ssid, size_t ssid_len, cmd->channels[i].channel = channels[i]->hw_value; }

- cmd->params.ssid_len = ssid_len; - if (ssid) - memcpy(cmd->params.ssid, ssid, ssid_len); + if (ssid) { + int len = clamp_val(ssid_len, 0, IEEE80211_MAX_SSID_LEN); + + cmd->params.ssid_len = len; + memcpy(cmd->params.ssid, ssid, len); + }

ret = wl1251_cmd_send(wl, CMD_SCAN, cmd, sizeof(*cmd)); if (ret < 0) {